Roofing and paving material



NITED STATES PATENT Orrrcn.

ROOFING AND PAVING MATERlALf SPECIFICATION formingpart or llettersPatent Not 248,075. dated October 11. 1881. Application filed December26, I879.

To all whom it may concern:

Be it known that I, Grnuslllflnnnnu, of Brookline, in the countyofNorfolk and State of'Mas'sachusetts, have invented a new and usefulImprovement in Roofing and Paving Materials, which invention is fullyset forth in the following specification.

The object of this invention is to provide a nonvolatile or non-dryingroofing and paying material that will be less expensive than thecompound t'uatural asphaltum and petroleum residuum described in myPatent No.179,828, and to accomplish this purpose without materiallysacrificing the toughness of this compound or resorting to an admixtureofcoal-tar material, as described in my specifications Cases 0 and D,filed July 7, 1379.

The'invention consists in a compound of natural asphaltum and theresiduum formed by the distillation or evaporation of waX-tail-- iugs orother equivalent non-volatile materials, (such'as are produced atasuitable high temperature, either as a residuum or distilled product, ator near the end of the distillation of natural bitumens, bituminouscoals, bituminous shales, bituminous schists, or other substancesyielding hydrocarbon oils by distillation, or at or near the end ofredistillation of such oils, or the residuunis of the same, at a hightemperature,) the distillation being carried to a point at which thesaid residuum has acquired about the consistency either of refinedTrinidad asphaltum or resin, preferably the former, being the same orsimilar to a product described in my specification dated December 22,1879.

That my invention may be more clearly-understood, I would state thatrefined Trinidad asphaltum 'is the most costly ingredient of thecompound above referred to, and since this material is not hard enoughto admit of an admixture of more than about ten to twenty per cent. ofthe heavy oil or residuum of petroleum to bring it to the properconsistency for roofing or paving purposes, the cost of the compound bythis method is unavoidably too high.

By my invention I am able to employ much less of the eipensive asphaltum by substituting a corresponding quantityof an artificialbituminous material ot'simiiar properties, (but lacking toughness at alow tmperatura) made by ings or other equivalent material are placed inany suitable iron retort or still, such as employed in the distillationof coal-tar or petroleum, and the operation conducted in a mannersimilar to that ofdistilling these materials, continuing thedistillation until the residue in the still has acquired the desiredconsistency, as determined by samples drawn and cooled at shortintervals as the distillation approaches the desired point. .Theresiduum maythen be drawn out to cool or mixed directly with hot melted,Trinidad or. other natural -asphaltum, in about equal parts or in anyother suitable. proportions, according to the requirements of thelocality or the use to which it is to be applied, agitating the mixturethoroughly'by any suitable means, and tempering as may be required withthe heavy oil or residuum of. petroleum or other equivalent softeningmaterial.

To adapt the compound to the saturation of paper or felt it should bemade of the consist ency of thick tar or soft pitch, as may be preferred.

A similar compound may be made by fusing together, in suitableproportions, either the compound of natural asphaltum and petroleumresiduum above mentioned and the pitchy re siduum from the distillationof wax-tailings or other equivalent material, and tempering with theheavy oil or residuum of petroleum.

My compound may be prepared also by distilling, in suitable proportions,a mixture of natural asphaltum, with or without an admixture ofpetroleum residuum, and wax-tailiogs or other equivalent non-volatile ornon-drying material; but I prefer the method above described.

By distilling from \vax-tailin'gs usually about forty per cent, by weight, of oil, (variable with difierent samples,) a pitchy residuum'isobtained, which, fused with refined Trinidad asphaltum,in the proportionof fifty parts of the latter to seventy parts of the former, will pro- Iduce directly a compound of about the consistency and toughness of theordinary pavin g-cement, although containing but about half as since thelatter much ofasphaltum, in this manner also greatly this and asphaltumwith petroleum residuum,

the heat of the sun than wax-tailings, which, being a distillate fromthe former, would, as is well known, contain decomposition productswhich would be more volatile; but, notwithstanding this appreciabledifference in quality, the wax-tailings may be used as a softeningortemper ing material for my com pound instead of the oily or tarryresiduum of petroleum when the latter cannot be conveniently procured.

' I am aware of the patent to A. J. Crawford, February 6, 1872, No.123,458,- and of the patent to N. B. Abbott, December 18, 1877, No.

198,260. The products from petroleum residuum described in said patentsare oils distilled from the residuum, as stated in the specifications,leaving (in the case of wax-tailing 's,an6.

is somewhat less affected by,

doubtless in others also) a retort residue of coke.

The product from wux tailings that I employ in my compound is nota'fluid, but a hardor stiff retort residue, possessing new propertiesadapted to new purposes, operating on a different principle, andproducing new results.

It differs so materially from the distillates from the residuumdescribed in said patents that neither of them can serve as a substitutefor my residuum for the purpose above specified, and they are bothhereby diselaimed.

What I claim as-new, and desire to secure by Letters Patent, isr Aroofing and paving material composed of natural asphaltum and abituminous residuum such as obtained by the distillation of waxtailings,substantially as and for the pnrpos'e set fortli.

CYRUS ill. \VARREN.

Witnesses:

J AS. B. BELL, WM. 0. SEVERSON.

